#! /usr/bin/python -E
# Authors: Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2007  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 only
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import sys
try:
    from optparse import OptionParser
    import ipa
    import ipa.entity
    import ipa.ipaclient as ipaclient
    import ipa.config

    import xmlrpclib
    import kerberos
    import errno
    import validate
    import socket
except ImportError:
    print >> sys.stderr, """\
There was a problem importing one of the required Python modules. The
error was:

    %s
""" % sys.exc_value
    sys.exit(1)

def parse_options():
    usage = "ipa-pwpolicy [--maxlife days] [--minlife hours] [--history number] [--minclasses number] [--minlength number] [-v|--verbose]\n"
    usage += "ipa-pwpolicy --show"
    parser = OptionParser(usage=usage, formatter=ipa.config.IPAFormatter())
    parser.add_option("--maxlife", dest="maxlife",
                      help="Max. Password Lifetime (days)")
    parser.add_option("--minlife", dest="minlife",
                      help="Min. Password Lifetime (hours)")
    parser.add_option("--history", dest="history",
                      help="Password History Size")
    parser.add_option("--minclasses", dest="minclasses",
                      help="Min. Number of Character Classes")
    parser.add_option("--minlength", dest="minlength",
                      help="Min. Length of Password")
    parser.add_option("--show", dest="show", action="store_true",
                      help="Show the current password policy")
    parser.add_option("--usage", action="store_true",
                      help="Program usage")
    parser.add_option("-v", "--verbose", action="store_true", dest="verbose",
                      help="Verbose output of the XML-RPC connection")

    ipa.config.add_standard_options(parser)
    options, args = parser.parse_args()

    if not options.show:
        if not options.maxlife and not options.minlife and not options.history and not options.minclasses and not options.minlength:
            parser.error("need at least one option of --maxlife, --minlife, --history, --minclasses or --minlength")

    ipa.config.init_config(options)

    return options, args

def show_policy(client):
    policy = client.get_password_policy()
    print "Password Policy"
    print "Min. Password Lifetime (hours): %s" % policy.getValues('krbminpwdlife')
    print "Max. Password Lifetime (days): %s" % policy.getValues('krbmaxpwdlife')
    print "Min. Number of Character Classes: %s" % policy.getValues('krbpwdmindiffchars')
    print "Min. Length of Password: %s" % policy.getValues('krbpwdminlength')
    print "Password History Size: %s" % policy.getValues('krbpwdhistorylength')

def update_policy(client, options):
    current = client.get_password_policy()

    new = ipa.entity.Entity(current.toDict())

    try:
        if options.maxlife:
            validate.is_integer(options.maxlife, min=0)
            new.setValue('krbmaxpwdlife', options.maxlife)
        if options.minlife:
            validate.is_integer(options.minlife, min=0)
            new.setValue('krbminpwdlife', options.minlife)
        if options.history:
            validate.is_integer(options.history, min=0)
            new.setValue('krbpwdhistorylength', options.history)
        if options.minclasses:
            validate.is_integer(options.minclasses, min=0)
            new.setValue('krbpwdmindiffchars', options.minclasses)
        if options.minlength:
            validate.is_integer(options.minlength, min=0)
            new.setValue('krbpwdminlength', options.minlength)
    except (validate.VdtTypeError, validate.VdtValueTooSmallError), e:
        print e
        return 1

    if int(new.getValue('krbminpwdlife')) > int(new.getValue('krbmaxpwdlife')) * 24:
        print "Maximum password life must be greater than minimum"
        return 1

    client.update_password_policy(new)
    return 0

def main():
    options, args = parse_options()

    client = ipaclient.IPAClient(verbose=options.verbose)

    if options.show:
        show_policy(client)
        return 0

    return update_policy(client, options)

try:
    if __name__ == "__main__":
        sys.exit(main())
except SystemExit, e:
    sys.exit(e)
except KeyboardInterrupt, e:
    sys.exit(1)
except xmlrpclib.Fault, fault:
    if fault.faultCode == errno.ECONNREFUSED:
        print "The IPA XML-RPC service is not responding."
    else:
        print fault.faultString
    sys.exit(1)
except kerberos.GSSError, e:
    print "Could not initialize GSSAPI: %s/%s" % (e[0][0], e[0][1])
    sys.exit(1)
except xmlrpclib.ProtocolError, e:
    print "Unable to connect to IPA server: %s" % (e.errmsg)
    sys.exit(1)
except ipa.ipaerror.IPAError, e:
    print "%s" % (e.message)
    sys.exit(1)
except socket.error, e:
    print e[1]
    print "Re-run with -v flag for more details."
except Exception, e:
    print "%s" % str(e)
    sys.exit(1)
